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trans-1,2-Dichloroethene is an organochloride with the molecular formula C$2$H$2$Cl$2$. It is a geometric isomer of cis-1,2-dichloroethene. The two are often used as a mixture. Both have modest solubility in water, are colorless liquids, and have sweet odors. The trans compound is mainly used as a specialized degreaser. In contrast to most cis-trans compounds, the Z isomer (cis) is more stable than the E isomer (trans) by 0.4 kcal/mol.

Production and reactions
Industrially both isomers of 1,2-dichloroethene arise as byproducts of the production of vinyl chloride, which is produced on a vast scale. Unlike vinyl chloride, neither isomer of 1,2-dichloroethene polymerizes.

trans-DCE is used for cleaning of electronics and other speciallized cleaning applications.

trans-1,2-Dichloroethene participates in cycloaddition reactions.

Safety
The isomers of 1,2-dichloroethene compounds have "moderate oral toxicity to rats".

Production
Industrially both isomers of 1,2-dichloroethene arise as byproducts of the production of vinyl chloride, which is produced on a vast scale. Unlike vinyl chloride, neither isomer of 1,2-dichloroethene polymerizes.

E-Z relative stability
In contrast to most cis-trans compounds, the Z isomer (cis) is more stable than the E isomer (trans) by 0.4 kcal/mol.

Safety
The isomers of 1,2-dichloroethene compounds have "moderate oral toxicity to rats".